二维 Ca2N/MoS2 供体-受体异质结构的欧姆接触,Physical Chemistry Chemical Physics

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二维 Ca2N/MoS2 供体-受体异质结构的欧姆接触
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2023-05-12 , DOI: 10.1039/d3cp01412f
Xinxin Wang ₁ , Shiqiang Yu ₁ , Yushuo Xu ₁ , Baibiao Huang ₁ , Ying Dai ₁ , Wei Wei ₁

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在当前阶段，传统的硅基器件受到缩放限制和费米能级钉扎效应的困扰。因此，为半导体寻找低电阻金属接触成为最重要的课题之一，二维（2D）金属/半导体接触变得非常有趣。或者，肖特基势垒和隧道势垒阻碍了它们的实际应用。在这项工作中，我们提出了一种通过构建供体-受体异质结构来降低接触势垒的新策略，即具有 Ca _{2的 Ca}₂ N/MoS ₂N 是一种二维电子材料，具有非常小的功函数和相当高的载流子浓度。异质结构的准键相互作用避免了费米能级钉扎效应的形成，并提高了隧穿概率。_{Ca 2} N 和 MoS ₂单分子层之间良好的 n 型欧姆接触形式，具有 100% 隧道概率和完美的线性I - V曲线，以及大的横向带弯曲也证明了接触的良好性能。我们验证了一个有趣的现象，即 Ca _{2 N 可以触发 MoS}₂从 2H 到 1T'的相变。此外，我们还发现 Ca _{2之间可以形成欧姆接触}N 和其他 2D 过渡金属二硫化物 (TMDC)，包括 WS ₂、MoSe ₂、WSe ₂和 MoTe ₂。

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Ohmic contacts of the two-dimensional Ca2N/MoS2 donor–acceptor heterostructure

In the current stage, conventional silicon-based devices are suffering from the scaling limits and the Fermi level pinning effect. Therefore, looking for low-resistance metal contacts for semiconductors has become one of the most important topics, and two-dimensional (2D) metal/semiconductor contacts turn out to be highly interesting. Alternatively, the Schottky barrier and the tunneling barrier impede their practical applications. In this work, we propose a new strategy for reducing the contact potential barrier by constructing a donor–acceptor heterostructure, that is, Ca₂N/MoS₂ with Ca₂N being a 2D electrene material with a significantly small work function and a rather high carrier concentration. The quasi-bond interaction of the heterostructure avoids the formation of a Fermi level pinning effect and gives rise to high tunneling probability. An excellent n-type Ohmic contact form between Ca₂N and MoS₂ monolayers, with a 100% tunneling probability and a perfect linear I–V curve, and large lateral band bending also demonstrates the good performance of the contact. We verify a fascinating phenomenon that Ca₂N can trigger the phase transition of MoS₂ from 2H to 1T′. In addition, we also identify that Ohmic contacts can be formed between Ca₂N and other 2D transition metal dichalcogenides (TMDCs), including WS₂, MoSe₂, WSe₂, and MoTe₂.

更新日期：2023-05-12

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